Ответ:

  1. а) \(1-\frac{5}{6}=\frac{1}{6}\).
  2. б) \(8\frac{3}{4}-7\frac{5}{6}=\frac{9}{12}-\frac{10}{12}+1=\frac{11}{12}\).
  3. в) \(5-2\frac{5}{9}=2\frac{4}{9}\).
  4. г) \(2\frac{13}{14}-1\frac{20}{21}=\frac{39}{42}+1-\frac{40}{42}=\frac{41}{42}\).
  5. д) \(2\frac{5}{8}-1\frac{3}{10}=1+\frac{25}{40}-\frac{12}{40}=1\frac{13}{40}\).
  6. е) \(8\frac{19}{20}-3\frac{7}{30}=5+\frac{57}{60}-\frac{14}{60}=5\frac{43}{60}\).